溃疡性结肠炎病情复发的先兆为（）
A.血沉加速
B.血白细胞计数增高
C.血清α2球蛋白增加
D.凝血酶原时间延长
E.凝血因子Ⅷ活性增加
参考答案：C
The conference has been held to discuss the effects of tourism________the wildlife in the area.[ ]
A. in
B. on
C. at
D. with
动密封O型圈模具分型部位采用（）度。
A.45
B.90
C.180
D.120
